---

yaml
---
r: 6045
b: refs/heads/master
c: 2e0593d
h: refs/heads/master
i:
  6043: a2e233d
v: v3

Author: brson

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: da064ef884994df1889d6a083349fb0bf6954400
+refs/heads/master: 2e0593d9999a50c74ea2962e53b8f5686037fd36

trunk/src/lib/vec.rs

@@ -446,6 +446,19 @@ fn filter<T>(f: block(T) -> bool, v: [mutable? T]) -> [T] {
     ret result;
 }
 
+/*
+Function: concat
+
+Concatenate a vector of vectors. Flattens a vector of vectors of T into
+a single vector of T.
+*/
+fn concat<T>(v: [mutable? [mutable? T]]) -> [T] {
+    // FIXME: So much copying
+    let new: [T] = [];
+    for inner: [T] in v { new += inner; }
+    ret new;
+}
+
 /*
 Function: foldl
 

trunk/src/test/stdtest/vec.rs

@@ -469,6 +469,11 @@ fn init_empty() {
 #[ignore]
 fn init_empty() { }
 
+#[test]
+fn concat() {
+    assert vec::concat([[1], [2,3]]) == [1, 2, 3];
+}
+
 // Local Variables:
 // mode: rust;
 // fill-column: 78;